Transmission mechanism



G. C. CARHART TRANSMISSION MECHANISM Filed Aug. 9, 1924 Sheets-Sheet l if? PM 42 4 PT 27 F4 \5/ .47 ,q :0

63 6/ 62 46 49 4/ I w w V I W ("31M April 22, 1930. G. c. CARHART ATTORNEYS Patented Apr-=6 22 133@ GEORGE C. CAIRHART, F SYR-AGUSE, NEW YORK, ASSIGNOR T0 BRUWN-LIPE GEAR COMPANY, OF SYRACUSE, NEW YORK, A CORPQTIQN OF NEW YQRK 'rnansinissron rancnan'rsra Application filed August 9, 1924.

This invention relates to transmission mechanism such as is used in motor Vehicles andhas for its object a particularly simple and efficient synchronizing clutch, especially adapted to be located between the transmission gearing and the propeller shaft which clutch comprises compactly arranged positively and frictionally engaging sections.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanying drawings in which like characters designate corresponding parts 1 in all the views.

Figure 1 is a vertical sectional View of this clutch, the contiguous part of a change speed transmission gearing being also shown.

Figure 2 is an enlarged fragmentary elevation of parts seen in Figure 1.

Figures 3 and 4 are enlarged sectional views taken respectively on the planes of lines 3-3 and H, Figure 1.

2 is the driven element or shaft which is connected by a suitable coupling to the propeller shaft of the vehicle, a part of this coupling being designated'3.

4 designates the change speed gearing.

6 is the transmission shaft of the gearing,

this being arranged in axial alinement with the driven element or shaft 2.

The construction of the transmission gearing forms no part of this invention and it may be of any suitable form, size and construction.

shaft 26 mounted in the clutch housing. v

The positive and friction clutches are combined in one mechanism including an inner drum or drum like member 30 mounted on the transmission shaft 6 outside of the casin of the transmission gearing and surroun g Serial N0. 731,209.

the shaft 2, an outer drum 31 mounted on the shaft 2 to rotate therewith, friction elements as sets of interleaved disks 32 interposed between the drums, the sets being interlocked respectively with the drums, at pressure plate 33 arranged to compress the disks against an abutment ring 33 in the outer drum, springs 34 interposed between the plate and the head of the drum 31, a positive clutch section 35 mounted on the shaft 2 to rotate therewith and slide axially thereof, this clutch section being shiftable into and out of engagement with internal teeth 36 in the drum 30 and into and out of engagement with the pressure plate to release and engage the disks and throwout means for shifting the clutch section 35 out of engagement with the teeth 36 and thereafter engaging the pressure plate 33 and shifting it to the left to disengage the disks. The drum 30 is usually formed integral with the shaft 6. The annular walls of these drums are usually segmental or in the form of spaced parallel bars 30*. 31" to facilitate the interlocking of the disks therein. The drum 31 is held from axial shifting by r a lock shoulder or ring 31. p As seen in Figs. 3 and 4, the shaft 2 is a splined shaft, and the section 35 has a bore shaped to slidably fit the shaft 2. Also the hub of the drum 31 is shaped to fit the splines of the shaft- 2.

The throwout mechanism includes a collar 38, slidable axially of the shaft 2 at the rear of the drum 31, and spaced parallel arms 39 overlying the ends of the splines, as seen in Fig. 3, and fixed to the clutch section 35, and to the collar 38, the arms 39 extending through the bore of the drum'31. The operating means for the throwout collar comprises a shifter arm 40 mounted on a rock shaft 41 journalled in the case 42, this shaft extending to the outside of the case 42 having connections with an operating member. The section 35 is spaced apart from the pressure plate and therefore upon rocking of the shaft ifs in a clockwise direction, Fig. i, the throW- out collar 38 first moves the section 35 out of engagement with the internal teeth 36 of the drum 30, thus disconnecting the positive clutch so that the drive is momentarily through tie :frictiori clutch and then moves into engagement with the pressure friction plate 33 to disengage the friction disks.

The operating members for the throvvout shaft ll comprise a 45 mounted on a stud projecting from the casing -12, the earn coacting with a follower on a. rock arm a7, mounted on the outer end of the shaft ll. 528 designates the follower which includes a lever pivoted at 49. to the reel; arm a? and carrying a roller 50 which coacts with the cam fthe follower lever d8 being; held from pivotal movement by a suitable adjusting screw 51 carried by the lever 47. The cam a5 is connected by suitable connections as by a link til. to a rock arni on the shaft 26 or" the operating means for the main clutch. The face of the care all is formed with a dwell portion 552, a. lift portion 53, and a dwell portion 5a, that is, there are two dwell portions and a lift portion between the dwell portions. Normally the roller 50 is engaged With dwell portion 52 and. upon depression of the clutch pedal 28 the cam 45 is rocked and the swell portion 52 is moved along the follower to permit the main clutch to he d1sengaged or partially disengaged. before the lift 53 of the cam rocks the arm liand" hence the throvvout shaft 41 to first disengage the positive clutch section 35 as the roller 50 rides on thelift 53 and shift it far enough to take up the lost motion hetween said section and the pressure plate 33 and shift the pressure plate to release the friction disirs. When the clutch pedal is the friction disks engage and the rotary motion is momentarily transferred through the disks and then the positive clutch 35, 36 and finally the main clutch is fully engaged. By adjusting the set screw 51 the follower or roller 50 can he ad" :isted to the 'lhe movement of th rovvout shaft -21 is against e action of sintahle spring;- 63 connected e rock arm 47.

The casing 4 2 is suitably supported on the gear casing it heino shown a cop provided Wi the head of the cup hearini or the S'. a flange its open end ah a? secured to tie rear Wall hat I claim is:

l. ansmission meshanisin the coinhinatioh a transmission shaft and a driven ii alineroent a clutch shafts c in a is;i ission s i it and driven shaft, the a soccer: mum. on o irtioii enc osing coacting axially shiii'tahle elements associa ed respective y With the drums, a toothed member slidable on the driven shaft within the first drum into and out of engagement with the internal teeth and throw-out mechanism arranged to successively disengage the toothed member from the internal teeth and disengage the friction elements and to engage said elements and the toothed member with the internal teeth in the reverse order.

2. In a transmission mechanism, the cornhination of a transmission shaft and a driven shaft arranged in axial alineroent, positive and friction clutches between the transmission shaft and the driven shaft including so inner and outer drums mounted respectively on said shafts and coacting friction elements ssociated respectively with the drums, the drum mounted on the driven shaft having an axially shiftahle part associated therewith, and coacting with the friction elements to engage the same, the inner drum being provided with internal teeth, a positive clutch section rotatable With and slida ble axially of the driven shaft Within the inner drum so and shiftahle into and out of engagement with the internal teeth and osing" also shiftahle into engagement with said part to shift the same axially to release said friction elements, and throw out means connected the 95 positive clutch section.

3. In a transmission mechanism. the'cornloination of a transmission shaft driven shaft arranged in axial alineinent clutch mechanism between said shafts comprising 189 drum mounted on the transmission shaft and enclosing a portion of the driven shaft, a second drum on the driven shaft and having a portion enclosing and spaced apart from the periphery of the former drum, friction elements between the drums, ,clutch head slidable on the driven shaft Within the first drum the first drum and the head hav ing means for positively" interlocking and the head being shii table into and out of no interlocking engagement with the first drum. and throw-out mechaoiszn arianged successively disengage the from the first drum and disengage the friction. elements and to engage said elements and the head with the first drum in the reverse order.

40 in a ansmission mechanism, the comhi'nation o= transmission shaft a driven ai arranged axial a clutch chanisiii between the shafts comprising E29 concentric "hs mounted resgoectively on the Lion meaos between the drums, pressure plate for engaging the friction means, clutch head slidahle on driven Wit" iriiier drum on transmis- (he throw-out movement of the head, a casing enclosing the clutch mechanism, a rock shaft journalled in the casing in the rear of the clutch and having an arm coacting with said 5 collar and means on the outside of the casing for rocking the shaft. In testimony whereof, I have hereunto signed my name, at Syracuse, in the county of Onondaga, and in the State of New York, 10 this 7th day of August, 1924.

' GEORGE C. CARHART. 

